Filter
Top Products
ISSUE
DRAWING NO.
DRAWING TITLE
DATE
Filename:
ECO No. DESCRIPTION OF CHANGE
L931TX_1.1.sch
DV29 AUDIO TRANSFORMER
Contact Engineer:
L931TX
21-Jul-2004
INITIALS
Printed:
1 1Sheet of
Notes:
Contact Tel: (01223) 203270Peter Gaggs
A & R Cambridge Ltd.
Pembroke Avenue
Cambridge CB5 9QR
Waterbeach
A3
Prototype Release
Voltage on Reservoir Capacitor
A.026-03-04PG
+VOUT_min
Transformer Specification for 100/115/230V 50/60Hz mains transformer (for audio)
Arcam Part Number L931TX
General Safety specification.
---------------------------------------------------
1. To standards BS415 / EN60065 - Class I / EN60742
2. Transformer to be used in equipment which will be sold worldwide and certified to CE, CB, UL and CSA Standards. All
materials etc to be adequate for worldwide safety approvals.
Material Safety Specification
---------------------------------------------------
3. Winding Wire to be Grade 2 (130°C rating) to BS 60317-4 1995
4. Mylar Polyester Insulator Rated to 130°C
Electrical Specification
---------------------------------------------------
5. Transformer to have dual 115V primaries to allow parallel operation for 100/115V input and series operation with 230V
input.
6. Transformer to have 2 secondary windings as shown in the adjacent diagram.
7. The output from the secondary windings are to be full wave rectified and smoothed as shown in the 'test circuit'
diagram.
8. Transformer input voltage range as follows:
115V: (85V to 132.5V) windings in parallel
230V: (170V to 265V) windings in series
Note. Extended input voltage range 85V to 265V
9. At minimum input voltage (170V AC with primaries in series) and maximum load of 120mA the minimum voltage on the
capacitor must be = (or >) 13.5V.
10. Temperature rise to be such that transformer is safe when operated in an enclosure with 50C maximum internal
temperature.
Mechanical Specification
---------------------------------------------------
11. Primary windings connect to 6 way MOLEX connector 39-01-2065. Secondary
windings connect to 4 way molex connector 39-01-3048. CONEXCON alternatives are allowed. Use MOLEX pin
44476-3112.
MOLEX connectors have pin numbers indicated on them.
12. Use 24 AWG wire with colours as shown. Primary wires are enclosed in a common
sleeve. Secondary wires are enclosed in a common sleeve. Use PVC sleeving.
13. Transformer to be marked with Arcam part number and issue number.
14. Transformer is for Hi-Fi audio; Acoustic noise must be inaudible.
15. Transformer to be supplied with mounting kit consisting of metal dished washer and 2 neoprene or similar washers.
PRIMARIES
65mm max
40mm max
LEADS EXIT NEAR TOP
220MM, +20, -0
TOP VIEW
SECONDARIES
04_E034
400MM, +20, -0
6 way MOLEX 39-01-2065
or CONEXCON 6740-1060
4 way MOLEX 39-01-3048
or CONEXCON 6740-1040
BROWN
WHITE
BLACK
BLUE
PRIMARY
SECONDARY
ORANGE
RED
GREEN
115V ac
115V ac
YELLOW
6 WAY CONN PIN 1
6 WAY CONN PIN 4
6 WAY CONN PIN 3
6 WAY CONN PIN 6
W02G
3300UF
4 WAY CONN PIN 2
4 WAY CONN PIN 1
4 WAY CONN PIN 4
4 WAY CONN PIN 3
W02G
TEST CIRCUIT
3300UF
+VOUT
-VOUT
0V
120mA load
-VOUT_min
0V
Minimum output voltage specified at:
120mA load
Min input voltage
Max load
(see text)
General Instrument / Vishay
123
456
6 way
12
34
4 way
Pin-outs of Molex
connectors, as viewed
looking down at the end the
wires enter the connector
Reduce specified output voltage to 13.5V at 120mA A.127-04-04PG04_E048
Production release. Add ferrite core to secondary cable 1.028-06-04PG04_E087
Ferrite core WURTH 74270062 (or
equivelant).
Secondary wires pass through ferrite.
Heatshrink tubing fitted over ferrite, but
not firmly to cable, so that ferrite is free to
move along cable
FERRITE
Add 20mm to all lead lengths, ferrite free to move on cable 1.121-07-04PG04_E107